Some of the go-go momentum stocks of last year, including Tesla Motors, SolarCity and Twitter have begun to sag in 2014.
Electronic car company Tesla, which has soared 487 percent over the last year, is down 10 percent since the beginning of the month.
SolarCity, a solar-panel financing and installation company chaired by Tesla founder Elon Musk, jumped 241 percent over the past year, but has dropped 26 percent this month.
Editor's Note: Free Video — ‘Rogue Calendar’ Could Turn 490% Profits
And social-networking titan Twitter has gained 84 percent since going public in November but has lost 13 percent since the start of March.
Some market participants say the decline of the highflyers sends a warning sign for the market as a whole,
The Wall Street Journal reports. But others say it's just the natural ebb and flow of highly speculative stocks.
Jerry Braakman, chief investment officer at First American Trust, apparently takes the former view. "It's really a broad selloff [of momentum stocks], people taking gains just because they might have some questions" about the strength of the broader market, he told The Journal.
Meanwhile, Josh Brown, CEO of Ritholtz Wealth Management, thinks that biotechnology stocks are in a bubble. About half the approximately 50 initial public offerings so far this year consisted of biotech companies,
he wrote on Yahoo Finance.
"The average gain for these new biotech offerings through the middle of March is over 50 percent. Anyone with a protein compound under a microscope and a clean suit can go public right now," Brown said.
Editor's Note: Free Video — ‘Rogue Calendar’ Could Turn 490% Profits
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